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  <h1 class="rank_chapter"
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<a name="ref_reservednames"></a>Chapter 4   Reserved names in FTL  </h1>
    
    
<p>The following names cannot be used for top-level variables without
      square-bracket syntax (as <tt style="color: #A03D10">.vars[&quot;in&quot;]</tt>), since they
      are keywords in FTL:</p>    <div class="itemizedlist">
<ul>
        <li>
          <tt style="color: #A03D10">true</tt>: boolean value ``true''
        </li>

        <li>
          <tt style="color: #A03D10">false</tt>: boolean value ``false''
        </li>

        <li>
          <tt style="color: #A03D10">gt</tt>: comparison operator ``greater
          than''
        </li>

        <li>
          <tt style="color: #A03D10">gte</tt>: comparison operator ``greater than or
          equivalent''
        </li>

        <li>
          <tt style="color: #A03D10">lt</tt>: comparison operator ``less
          than''
        </li>

        <li>
          <tt style="color: #A03D10">lte</tt>: comparison operator ``less than or
          equivalent''
        </li>

        <li>
          <tt style="color: #A03D10">as</tt>: used by a few directives
        </li>

        <li>
          <tt style="color: #A03D10">in</tt>: used by a few directives
        </li>

        <li>
          <tt style="color: #A03D10">using</tt>: used by a few directives
        </li>
      </ul>    </div>
  
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